Preliminary study on Late Triassic to Early Jurassic strata and floral variation in Hechuan region of Chongqing,southern Sichuan Basin  

作　　者：Ning TIAN Yongdong WANG Xiaoju YANG Qing NI Zikun JIANG 

机构地区：[1]Nanjing Institute of Geology and Paleontology, Chinese Academy of Sciences, Nanjing 210008, China [2]Graduate School of Chinese Academy of Sciences, Beijing 100049, China

出　　处：《Global Geology》2008年第3期125-129,共5页世界地质（英文版）

基　　金：National Natural Sciences Foundation of China (No. 40472004)

摘　　要：The end-Triassic mass extinction event is extensively known, however, the terrestrial response of this event is still poorly understood. Here we briefly report our preliminary results on the variation of floral diversity through the Triassic/Jurassic boundary deposits in the Tanha section of Hechuan region, Chongqing, southern China. It is recognized that the floral hiodiversity of the Hechuan region shows a distinct change through the Triassic and Jurassic transition; and the floral diversity loss reaches up to 92. 5% at species level. Meanwhile, in northeastern region of the Sichuan Basin, the floral diversity declines by about 50% across the T/J boundary at species level with a remarkable turnover of genera and species. The potential reasons and mechanisms that cause the floral diversity differentiation of the T/J boundary in the Sichuan Basin are briefly discussed in this note.The end-Triassic mass extinction event is extensively known, however, the terrestrial response of this event is still poorly understood. Here we briefly report our preliminary results on the variation of floral diversity through the Triassic/Jurassic boundary deposits in the Tanba section of Hechuan region, Chongqing, southern China. It is recognized that the floral biodiversity of the Hechuan region shows a distinct change through the Triassic and Jurassic transition; and the floral diversity loss reaches up to 92.5% at species level. Meanwhile, in northeastern region of the Sichuan Basin, the floral diversity declines by about 50% across the T/J boundary at species level with a remarkable turnover of genera and species. The potential reasons and mechanisms that cause the floral diversity differentiation of the T/J boundary in the Sichuan Basin are briefly discussed in this note.

关 键 词：Triassic/Jurassic boundary mass extinction floral variation Hechuan southern Sichuan Basin 

分 类 号：Q91[天文地球—古生物学与地层学]